Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Source for: |
| 3 | * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver. |
| 4 | * For use with Cypress Txx3xx parts. |
| 5 | * Supported parts include: |
| 6 | * CY8CTST341 |
| 7 | * CY8CTMA340 |
| 8 | * |
| 9 | * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc. |
| 10 | * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * version 2, and only version 2, as published by the |
| 15 | * Free Software Foundation. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License along |
| 23 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 24 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 25 | * |
| 26 | * Contact Cypress Semiconductor at www.cypress.com <kev@cypress.com> |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include "cyttsp_core.h" |
| 31 | |
| 32 | #include <linux/i2c.h> |
| 33 | #include <linux/input.h> |
| 34 | |
| 35 | #define CY_I2C_DATA_SIZE 128 |
| 36 | |
| 37 | static int cyttsp_i2c_read_block_data(struct cyttsp *ts, |
| 38 | u8 addr, u8 length, void *values) |
| 39 | { |
| 40 | struct i2c_client *client = to_i2c_client(ts->dev); |
| 41 | struct i2c_msg msgs[] = { |
| 42 | { |
| 43 | .addr = client->addr, |
| 44 | .flags = 0, |
| 45 | .len = 1, |
| 46 | .buf = &addr, |
| 47 | }, |
| 48 | { |
| 49 | .addr = client->addr, |
| 50 | .flags = I2C_M_RD, |
| 51 | .len = length, |
| 52 | .buf = values, |
| 53 | }, |
| 54 | }; |
| 55 | int retval; |
| 56 | |
| 57 | retval = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
| 58 | if (retval < 0) |
| 59 | return retval; |
| 60 | |
| 61 | return retval != ARRAY_SIZE(msgs) ? -EIO : 0; |
| 62 | } |
| 63 | |
| 64 | static int cyttsp_i2c_write_block_data(struct cyttsp *ts, |
| 65 | u8 addr, u8 length, const void *values) |
| 66 | { |
| 67 | struct i2c_client *client = to_i2c_client(ts->dev); |
| 68 | int retval; |
| 69 | |
| 70 | ts->xfer_buf[0] = addr; |
| 71 | memcpy(&ts->xfer_buf[1], values, length); |
| 72 | |
| 73 | retval = i2c_master_send(client, ts->xfer_buf, length + 1); |
| 74 | |
| 75 | return retval < 0 ? retval : 0; |
| 76 | } |
| 77 | |
| 78 | static const struct cyttsp_bus_ops cyttsp_i2c_bus_ops = { |
| 79 | .bustype = BUS_I2C, |
| 80 | .write = cyttsp_i2c_write_block_data, |
| 81 | .read = cyttsp_i2c_read_block_data, |
| 82 | }; |
| 83 | |
| 84 | static int __devinit cyttsp_i2c_probe(struct i2c_client *client, |
| 85 | const struct i2c_device_id *id) |
| 86 | { |
| 87 | struct cyttsp *ts; |
| 88 | |
| 89 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 90 | dev_err(&client->dev, "I2C functionality not Supported\n"); |
| 91 | return -EIO; |
| 92 | } |
| 93 | |
| 94 | ts = cyttsp_probe(&cyttsp_i2c_bus_ops, &client->dev, client->irq, |
| 95 | CY_I2C_DATA_SIZE); |
| 96 | |
| 97 | if (IS_ERR(ts)) |
| 98 | return PTR_ERR(ts); |
| 99 | |
| 100 | i2c_set_clientdata(client, ts); |
| 101 | |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static int __devexit cyttsp_i2c_remove(struct i2c_client *client) |
| 106 | { |
| 107 | struct cyttsp *ts = i2c_get_clientdata(client); |
| 108 | |
| 109 | cyttsp_remove(ts); |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static const struct i2c_device_id cyttsp_i2c_id[] = { |
| 115 | { CY_I2C_NAME, 0 }, |
| 116 | { } |
| 117 | }; |
| 118 | MODULE_DEVICE_TABLE(i2c, cyttsp_i2c_id); |
| 119 | |
| 120 | static struct i2c_driver cyttsp_i2c_driver = { |
| 121 | .driver = { |
| 122 | .name = CY_I2C_NAME, |
| 123 | .owner = THIS_MODULE, |
| 124 | .pm = &cyttsp_pm_ops, |
| 125 | }, |
| 126 | .probe = cyttsp_i2c_probe, |
| 127 | .remove = __devexit_p(cyttsp_i2c_remove), |
| 128 | .id_table = cyttsp_i2c_id, |
| 129 | }; |
| 130 | |
Dmitry Torokhov | 4a53383 | 2012-03-16 23:05:44 -0700 | [diff] [blame] | 131 | module_i2c_driver(cyttsp_i2c_driver); |
Javier Martinez Canillas | 4065d1e | 2012-01-31 00:18:00 -0800 | [diff] [blame] | 132 | |
| 133 | MODULE_LICENSE("GPL"); |
| 134 | MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver"); |
| 135 | MODULE_AUTHOR("Cypress"); |
| 136 | MODULE_ALIAS("i2c:cyttsp"); |